An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
van Helvoort HA, van de Pol MH, Heijdra YF, Dekhuijzen PN.van Helvoort HA, et al. Among authors: heijdra yf.Respir Med. 2005 Dec;99(12):1555-67. doi: 10.1016/j.rmed.2005.03.028.Respir Med. 2005.PMID: 15890510Free article.
van Helvoort HA, Heijdra YF, de Boer RC, Swinkels A, Thijs HM, Dekhuijzen PN.van Helvoort HA, et al. Among authors: heijdra yf.Chest. 2007 Feb;131(2):439-45. doi: 10.1378/chest.06-1655.Chest. 2007.PMID: 17296645Clinical Trial.
van Helvoort HA, de Boer RC, van de Broek L, Dekhuijzen R, Heijdra YF.van Helvoort HA, et al. Among authors: heijdra yf.Arch Phys Med Rehabil. 2011 Jan;92(1):111-7. doi: 10.1016/j.apmr.2010.08.012. Epub 2010 Nov 18.Arch Phys Med Rehabil. 2011.PMID: 21092932Clinical Trial.
van Helvoort HA, Willems LM, Dekhuijzen PR, van Hees HW, Heijdra YF.van Helvoort HA, et al. Among authors: heijdra yf.NPJ Prim Care Respir Med. 2016 Oct 13;26:16054. doi: 10.1038/npjpcrm.2016.54.NPJ Prim Care Respir Med. 2016.PMID: 27734959Free PMC article.